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Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 ACS+Appl+Mater+Interfaces 2017 ; 9 (11): 9506-9515 Nephropedia Template TP
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High-Purity Magnesium Staples Suppress Inflammatory Response in Rectal Anastomoses #MMPMID28240546
Xia J; Chen H; Yan J; Wu H; Wang H; Guo J; Zhang X; Zhang S; Zhao C; Chen Y
ACS Appl Mater Interfaces 2017[Mar]; 9 (11): 9506-9515 PMID28240546show ga
Magnesium-based materials are promising biodegradable implants, although the impact of magnesium on rectal anastomotic inflammation is poorly understood. Thus, we investigated the inflammatory effects of high-purity Mg staples in rectal anastomoses by in vivo luciferase reporter gene expression in transgenic mice, hematoxylin-eosin staining, immunohistochemistry, and Western blotting. As expected, strong IL-1beta-mediated inflammation and inflammatory cell infiltration were observed 1 day after rectal anastomoses were stapled with high-purity Mg or Ti. However, inflammation and inflammatory cell infiltration decreased more robustly 4-7 days postoperation in tissues stapled with high-purity Mg. This rapid reduction in inflammation was confirmed by immunohistochemical analysis of IL-6 and TNF-alpha. Western blot also suggested that the reduced inflammatory response is due to suppressed TLR4/NF-kappaB signaling. In contrast, MCP-1, uPAR, and VEGF were abundantly expressed, in line with the notion that expression of these proteins is regulated by feedback between the VEGF and NF-kappaB pathways. In vitro expression of MCP-1, uPAR, and VEGF was also similarly high in primary rectal mucosal epithelial cells exposed to extracts from Mg staples, as measured by antibody array. Collectively, the results suggest that high-purity Mg staples suppress the inflammatory response during rectal anastomoses via TLR4/NF-kappaB and VEGF signaling.